<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Teste Aptana</title>

<style>
	body
	{
		background-color:#003366;
		overflow: hidden;
		
	}
	
</style>

<script>
	function teste()
	{
		document.getElementById('numero').value++;		
	}	
</script>

</head>
<body>

<div>
	<input type="text" name="numero" id="numero" value="1" onclick="teste()" />	
</div>

</body>
</html>